Flapping Wing Aerodynamics: Progress and Challenges

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Bifurcating flows of plunging aerofoils at high Strouhal numbers (2012, background): “For α = 0◦ (figure 10a), generally there is decreasing drag coefficient with increasing Strouhal number, with greater effect for greater amplitude as predicted by Garrick approximations and previously observed (Platzer et al. 2008).”
Direct measurement of thrust and efficiency of an airfoil undergoing pure pitching (2015, background): “Apart from a variety of outstanding papers dealing with more biomimetic systems, noteworthy reviews of elementary flat-plate and airfoil studies include McCroskey (1982), Rozhdestvensky & Ryzhov (2003) and Platzer et al. (2008).”
Unsteady force generation and vortex dynamics of pitching and plunging aerofoils (2012, positive): “There have been many experimental and computational studies on pitching and plunging wing in periodic motion with simplifying assumptions to obtain fundamental understanding in unsteady aerodynamics [5].”